voldemort.store.memory
Class InMemoryStorageEngine<K,V,T>

java.lang.Object
  voldemort.store.AbstractStore<K,V,T>
      voldemort.store.AbstractStorageEngine<K,V,T>
          voldemort.store.memory.InMemoryStorageEngine<K,V,T>

All Implemented Interfaces:

StorageEngine<K,V,T>, Store<K,V,T>

public class InMemoryStorageEngine<K,V,T>
extends AbstractStorageEngine<K,V,T>

A simple non-persistent, in-memory store. Useful for unit testing. TODO Rewrite this class using striped locks for more granular locking.

Field Summary

protected java.util.concurrent.ConcurrentMap<K,java.util.List<Versioned<V>>>

map

Constructor Summary

InMemoryStorageEngine(java.lang.String name)

InMemoryStorageEngine(java.lang.String name, java.util.concurrent.ConcurrentMap<K,java.util.List<Versioned<V>>> map)

Method Summary

boolean	delete(K key)
boolean	delete(K key, Version version) Delete all entries prior to the given version
void	deleteAll()
ClosableIterator<Pair<K,Versioned<V>>>	entries() Get an iterator over pairs of entries in the store.
ClosableIterator<Pair<K,Versioned<V>>>	entries(int partition) Get an iterator over pairs of entries in a store's partition.
java.util.List<Versioned<V>>	get(K key, T transform) Get the value associated with the given key
java.util.Map<K,java.util.List<Versioned<V>>>	getAll(java.lang.Iterable<K> keys, java.util.Map<K,T> transforms) Get the values associated with the given keys and returns them in a Map of keys to a list of versioned values.
java.util.List<Version>	getVersions(K key) Get the versions associated with the given key.
ClosableIterator<K>	keys() Get an iterator over keys in the store.
ClosableIterator<K>	keys(int partition) Get an iterator over keys in the store's partition Note that the iterator need not be threadsafe, and that it must be manually closed after use.
java.util.List<Versioned<V>>	multiVersionPut(K key, java.util.List<Versioned<V>> values) Atomically update storage with the list of versioned values for the given key, to improve storage efficiency.
void	put(K key, Versioned<V> value, T transforms) Associate the value with the key and version in this store
java.lang.String	toString()
java.lang.String	toString(int size)
void	truncate() Truncate all entries in the store

Methods inherited from class voldemort.store.AbstractStorageEngine

beginBatchModifications, endBatchModifications, getAndLock, isPartitionAware, isPartitionScanSupported, putAndUnlock, releaseLock, resolveAndConstructVersionsToPersist

Methods inherited from class voldemort.store.AbstractStore

close, delete, get, getAll, getCapability, getName, put

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface voldemort.store.Store

close, delete, get, getAll, getCapability, getName, put

Field Detail

map

protected final java.util.concurrent.ConcurrentMap<K,java.util.List<Versioned<V>>> map

Constructor Detail

InMemoryStorageEngine

public InMemoryStorageEngine(java.lang.String name)

InMemoryStorageEngine

public InMemoryStorageEngine(java.lang.String name,
                             java.util.concurrent.ConcurrentMap<K,java.util.List<Versioned<V>>> map)

Method Detail

deleteAll

public void deleteAll()

delete

public boolean delete(K key)

delete

public boolean delete(K key,
                      Version version)

Description copied from interface: Store

Delete all entries prior to the given version

Specified by:

delete in interface Store<K,V,T>

Overrides:

delete in class AbstractStore<K,V,T>

Parameters:

key - The key to delete

version - The current value of the key

Returns:

True if anything was deleted

getVersions

public java.util.List<Version> getVersions(K key)

Description copied from interface: Store

Get the versions associated with the given key. This is used in a put call to write a new value for this key

Specified by:

getVersions in interface Store<K,V,T>

Overrides:

getVersions in class AbstractStore<K,V,T>

Parameters:

key - The key to retrieve the versions for

Returns:

List of Versions associated with this key.

get

public java.util.List<Versioned<V>> get(K key,
                                        T transform)
                                 throws VoldemortException

Description copied from interface: Store

Get the value associated with the given key

Specified by:

get in interface Store<K,V,T>

Overrides:

get in class AbstractStore<K,V,T>

Parameters:

key - The key to check for

Returns:

The value associated with the key or an empty list if no values are found.

Throws:

VoldemortException

getAll

public java.util.Map<K,java.util.List<Versioned<V>>> getAll(java.lang.Iterable<K> keys,
                                                            java.util.Map<K,T> transforms)
                                                     throws VoldemortException

Description copied from interface: Store

Get the values associated with the given keys and returns them in a Map of keys to a list of versioned values. Note that the returned map will only contain entries for the keys which have a value associated with them.

Specified by:

getAll in interface Store<K,V,T>

Overrides:

getAll in class AbstractStore<K,V,T>

Parameters:

keys - The keys to check for.

Returns:

A Map of keys to a list of versioned values.

Throws:

VoldemortException

put

public void put(K key,
                Versioned<V> value,
                T transforms)
         throws VoldemortException

Description copied from interface: Store

Associate the value with the key and version in this store

Specified by:

put in interface Store<K,V,T>

Overrides:

put in class AbstractStore<K,V,T>

Parameters:

key - The key to use

value - The value to store and its version.

Throws:

VoldemortException

multiVersionPut

public java.util.List<Versioned<V>> multiVersionPut(K key,
                                                    java.util.List<Versioned<V>> values)

Description copied from interface: StorageEngine

Atomically update storage with the list of versioned values for the given key, to improve storage efficiency.

Specified by:

multiVersionPut in interface StorageEngine<K,V,T>

Overrides:

multiVersionPut in class AbstractStorageEngine<K,V,T>

Parameters:

key - Key to write

values - List of versioned values to be written atomically.

Returns:

list of obsolete versions that were rejected

entries

public ClosableIterator<Pair<K,Versioned<V>>> entries()

Description copied from interface: StorageEngine

Get an iterator over pairs of entries in the store. The key is the first element in the pair and the versioned value is the second element. Note that the iterator need not be threadsafe, and that it must be manually closed after use.

Specified by:

entries in interface StorageEngine<K,V,T>

Overrides:

entries in class AbstractStorageEngine<K,V,T>

Returns:

An iterator over the entries in this StorageEngine.

keys

public ClosableIterator<K> keys()

Description copied from interface: StorageEngine

Get an iterator over keys in the store. Note that the iterator need not be threadsafe, and that it must be manually closed after use.

Specified by:

keys in interface StorageEngine<K,V,T>

Overrides:

keys in class AbstractStorageEngine<K,V,T>

Returns:

An iterator over the keys in this StorageEngine.

entries

public ClosableIterator<Pair<K,Versioned<V>>> entries(int partition)

Description copied from interface: StorageEngine

Get an iterator over pairs of entries in a store's partition. The key is the first element in the pair and the versioned value is the second element. Note that the iterator need not be threadsafe, and that it must be manually closed after use.

Specified by:

entries in interface StorageEngine<K,V,T>

Overrides:

entries in class AbstractStorageEngine<K,V,T>

Parameters:

partition - partition whose entries are to be fetched

Returns:

An iterator over the entries in this StorageEngine.

keys

public ClosableIterator<K> keys(int partition)

Description copied from interface: StorageEngine

Get an iterator over keys in the store's partition Note that the iterator need not be threadsafe, and that it must be manually closed after use.

Specified by:

keys in interface StorageEngine<K,V,T>

Overrides:

keys in class AbstractStorageEngine<K,V,T>

Parameters:

partition - partition whose keys are to be fetched

Returns:

An iterator over the keys in this StorageEngine.

truncate

public void truncate()

Description copied from interface: StorageEngine

Truncate all entries in the store

Specified by:

truncate in interface StorageEngine<K,V,T>

Overrides:

truncate in class AbstractStorageEngine<K,V,T>

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

toString

public java.lang.String toString(int size)